The difference between ZNA 30 and ZNA 50 modThe appearance between them is almost the same.The difference is that the ZNA 50 is a upgraded version of ZNA 30.The reason why it is called ZNA 50 is because the ZNA 50 can reach 50W with the help of high quality Cloupor chipset yihi sx350.Besides , by upgrading,the ZNA 50 gets the adjustable positive pin and have a powerful function that is short circuit current protection.